Adaptive radio transceiver with a local oscillator

• US 7,970,358 B2
• Filed: 05/18/2010
• Issued: 06/28/2011
• Est. Priority Date: 10/21/1999
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Maryam, Darabi, Hooman, Rofougaran, Ahmadreza
• Primary Examiner(s): PHAM, TUAN
• Application Number:
  US12/782,405
• Publication Number:
  US 20100295598A1
• Time in Patent Office: 406 Days
• Field of Search: 455/85, 455/86, 455/141, 455/146, 455/147, 455/151.3, 455/183.1, 455/207, 455/208, 455/209, 455/236.1, 455/264, 455/315, 455/326, 331 37- 43
• US Class Current: 455/86
• CPC Class Codes: H03B 21/01 by beating unmodulated signals of different frequencies
• CPC Class Codes: H03B 27/00 Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
• CPC Class Codes: H03H 11/1291 Current or voltage controlled filters
• CPC Class Codes: H03H 2011/0494 Complex filters
• CPC Class Codes: H03H 21/0001 Analogue adaptive filters
• CPC Class Codes: H03H 21/0012 Digital adaptive filters
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 17/104 of other parameters, e.g. DC offset, delay or propagation times
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/19 Self-testing arrangements

Abstract

An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A wireless spread spectrum communications device, comprising:

a local oscillator comprising;

a quadrature oscillator configured to generate a first signal having a first frequency,

a quadrature frequency divider configured to generate a second signal from the first signal, the second signal having a second frequency, and

a first quadrature mixer configured to mix the first signal and the second signal and configured to provide a third signal having a third frequency; and

a transmitter that transmits wireless radio signals, wherein the transmitter is operatively coupled to the local oscillator, wherein the transmitter comprises a second quadrature mixer configured to mix the third signal and a fourth signal, and

wherein the local oscillator and the transmitter are integrated on a single integrated circuit chip.

2. The wireless spread spectrum communications device according to claim 1, wherein the local oscillator and the transmitter employ CMOS technology.

3. The wireless spread spectrum communications device according to claim 1, wherein the third frequency comprises a sum of the first frequency and the second frequency.

4. The wireless spread spectrum communications device according to claim 1, wherein the fourth signal comprises a baseband signal.

5. The spread spectrum wireless communications device according to claim 1, wherein the quadrature frequency divider is programmable.

6. The wireless spread spectrum communications device according to claim 1, wherein the quadrature oscillator comprises a voltage controlled oscillator.

7. The wireless spread spectrum communications device according to claim 6, wherein the local oscillator comprises a phase locked loop that is configured to control the first frequency of the first signal generated by the voltage controlled oscillator.

8. The wireless spread spectrum communications device according to claim 7,

wherein the local oscillator comprises a second quadrature oscillator and a second frequency divider,

wherein the second frequency divider is operatively coupled to the second oscillator and the voltage controlled oscillator, and

wherein the second quadrature oscillator receives an output of the second frequency divider.

9. The wireless spread spectrum communications device according to claim 8, wherein the second frequency divider comprises a programmable divisor input.

10. The wireless spread spectrum communications device according to claim 1, comprising:

a receiver that receives second wireless radio signals, wherein the receiver comprises a third quadrature mixer that is configured to mix the third signal and a fifth signal.

11. The wireless spread spectrum communications device according to claim 8, comprising:

a receiver that receives second wireless radio signals, wherein the receiver comprises a third quadrature mixer that is configured to mix an output of the second quadrature oscillator with a fifth signal.

12. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device performs orthogonal frequency division multiplexing.

13. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device performs spread spectrum modulation.

14. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device performs frequency hopping.

15. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device performs direct sequence spread spectrum modulation.

16. The wireless spread spectrum communications device according to claim 1, wherein the local oscillator or the transmitter employs CMOS technology.

17. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device can be programmed to support a plurality of different wireless spread spectrum modulation techniques.

18. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device supports a plurality of different wireless spread spectrum modulation techniques.

19. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device supports wireless communications using at least two of the following:

orthogonal frequency division multiplexing communications, spread spectrum communications, Bluetooth communications and wireless local area network communications.

20. The wireless spread spectrum communications device according to claim 1, wherein the wireless spread spectrum communications device supports wireless communications using Bluetooth communications and wireless communications using wireless local area network communications.